Sealey WallDrive Socket 9mm 1/4" Square Drive Individual Sockets S1409. Cold-forged Chrome Vanadium steel socket. Hardened and tempered for added strength. Chrome plated in half chrome, half satin finish with knurled ring for extra grip with oily fingers. WallDrive® socket configuration. Specifications: Type: WallDrive, Lifetime Warranty: Yes, Material: Chrome Vanadium Steel, Size: 9mm.